Solve bug #320545 in the least hacky way: disable --no-undefined for
the Ruby-Gnome2 bindings. Unfortunately they rely on a
partially-undefined behaviour, let's just hope they'll never come
giving us trouble for this.
Also avoid using cp -a (non-portable) for installing samples, use
insinto/doins instead.

Initial version of new ruby-ng-gnome2 eclass. This eclass supersedes ruby-gnome2 and uses ruby-ng to allow parallel installation of the ruby-gnome2 packages.

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